I created a new simulation project called 'Press Test':
Plate to hold on pressure
More of my public projects can be found here.
I noticed that your geometry is a shell. In order to create a mesh and do simulations for structural analysis you need to upload geometry with a solid. Please see this forum post for more info.: Can a tetrahedral mesh be created using geometry with only shells/faces?
You can also have a look at this project for setting up your simple case: https://www.simscale.com/projects/ahmedhussain18/drum2/
Hope this helps. If you have any question/s, feel free to ask.